Microchip Technology AT28BV16-25TI

Overview

AT28BV16-25TI from Atmel is a 16K (2,048 × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 2.7–3.6 V operation, 250 ns read access time, and industrial temperature range (–40°C to +85°C). It supports direct microprocessor control via DATA polling and RDY/BUSY output (TSOP package), enabling embedded systems to manage nonvolatile storage without external timing logic.

For engineers reviewing the AT28BV16-25TI datasheet, AT28BV16-25TI pinout, AT28BV16-25TI application, or AT28BV16-25TI equivalent, this device serves as a drop-in replacement for legacy SRAM-compatible EEPROMs in boot code storage, configuration memory, and calibration data retention where low-voltage operation and write-cycle visibility are critical.

Technical Context

The AT28BV16-25TI operates as a static RAM-compatible parallel EEPROM: reads require CE and OE low with WE high; byte writes initiate on falling WE (or CE) while OE is high, latching address and data internally. Its self-timed write cycle (3 ms typical) eliminates external wait-state generation.

It implements three hardware write protections: VCC sense (<2.0 V inhibits writes), 5 ms power-on delay, and active-level inhibit (OE low, CE high, or WE high blocks writes). The TSOP variant provides an open-drain RDY/BUSY signal; all packages support DATA polling via I/O7 complement detection during write completion.

Key Specifications

Pinout & Package

AT28BV16-25TI is supplied in a 28-lead Plastic Thin Small Outline Package (TSOP), JEDEC MS-016AE compliant, with 0.55 mm lead pitch and 8.10 mm × 13.7 mm body dimensions. Pin 1 is marked by a notch or index area; package is RoHS-compliant and moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar parallel EEPROM applications.

Compared with AT28C16 and ST M28W160ECB, the AT28BV16-25TI uniquely balances 3.3 V compatibility, SRAM-like simplicity, hardware RDY/BUSY signaling, and industrial temperature support - making it optimal for retrofitting legacy 5 V systems to low-voltage operation without redesigning memory interface logic.

Availability

AT28BV16-25TI is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply across extended product lifecycles.

Supply support for AT28BV16-25TI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded and industrial markets.

The AT28BV16 product line was designed for applications needing simple, robust, low-voltage parallel EEPROMs with SRAM-like interface behavior and enhanced write protection - targeting industrial control, medical devices, and automotive subsystems.

FAQ

What is the maximum operating temperature range for the AT28BV16-25TI?

The AT28BV16-25TI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the device's DC and AC characteristics table and applies to all electrical parameters including read access time (250 ns), standby current (≤50 µA), and write cycle time (3.0 ms). The rating reflects continuous operation under bias, not storage only.

Does the AT28BV16-25TI support hardware write protection independent of software control?

Yes, the AT28BV16-25TI implements three hardware write protection mechanisms: VCC sense (writes disabled below ~2.0 V), automatic 5 ms power-on delay after VCC stabilization, and active-level inhibit (any of OE low, CE high, or WE high blocks writes). These operate independently of firmware and require no initialization sequence.

Can the AT28BV16-25TI be used as a direct replacement for the AT28C16 in existing designs?

The AT28BV16-25TI shares the same JEDEC byte-wide pinout and 16K × 8 organization as the AT28C16, but operates at 2.7–3.6 V versus 4.5–5.5 V. Direct replacement requires verifying voltage compatibility of the host system's I/O drivers and ensuring RDY/BUSY handling matches the TSOP package's open-drain output - no change is needed for DATA polling use.

What is the purpose of the RDY/BUSY pin on the AT28BV16-25TI?

The RDY/BUSY pin on the AT28BV16-25TI is an open-drain status output that pulls low during internal write operations and releases high upon completion. It enables hardware wait-state insertion in microprocessor buses, eliminating the need for continuous software polling of I/O7 and reducing CPU overhead during EEPROM writes.

How is the 32-byte device identification area accessed in the AT28BV16-25TI?

The 32-byte identification area (addresses 7E0H–7FFH) in the AT28BV16-25TI is accessed by raising A9 to 12 ± 0.5 V while applying standard read or write timing. This high-voltage enable allows secure, isolated access to the extended memory without affecting the main 2,048-word array - useful for serialization or cryptographic key storage.